<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<button onclick="handleClick()">立即下载</button>
		<iframe name="myIframe" style="display:none"></iframe>
		<script>
		    var handleClick = () => {
		        window.open('/download/1.png', 'myIframe');
		    }
		</script>
	</body>
</html>